C
O
N
T
E
N
T
S
STANDARD THERMOWELLS:
Type 111 and 113 Standard Screw- in Thermowells…………………………… 4
Type 115 and 117 Tapered Screw- in Thermowells……………………………. 5
Type 121 through 128 Screw- in Thermowells with Lagging
Extensions……………………………………………………………………. 6
Test Thermowells – Part No. 9100…………………………………………….. 6
Type 131 and 133 Flanged Thermowells…………………………………….... 7
Options for Flanged Thermowells – Part No’s. 9161-9167…………………….7
Thermowells for 3/8” Diameter Elements
Type 112, 114, 116, 118, 132 and 134………………………………………. 8
Limited Space Thermowells…………………………………………………… 9
Thermowells with ½” NPT Process Connection – Type 101………………….. 9
THERMOWELLS WITH SPECIAL CONNECTIONS:
Type 141-144 Van Stone Thermowells with Options 97105-98405…………... 10
Type 145-148 Ground Joint Thermowells……………………………………... 10
Type 151-154 Socket Weld Thermowells……………………………………... 11
Type 155-156 Weld- in Thermowells…………………………………………... 11
OPTIONS FOR THERMOWELLS:
Tantalum Sheath for Flanged Thermowells – Part No. 9130………………….. 12
Special Coatings – Part No’s 9131-9137………………………………………. 12
Thermowells with Solid Stellite Tips – Part No. 9140………………………… 13
Special Testing – Part No’s 9150-9153………………………………………... 13
PROTECTION TUBES:
Metal Protection Tubes – 800 Series…………………………………………... 14
Ceramic Protection Tubes – Type 191 through 196…………………………… 16
Metal-Ceramic Protection Tubes – Type 197 through 199……………………. 17
TECHNICAL INFORMATION AND DESIGN CONSIDERATIONS:
Vibration, Pressure, and Maximum Length……………………………………. 18
Recommended Maximum Operation Temperatures and
Stress Values for Common Thermowell Materials………………………….. 19
Chemical and Physical Properties of Materials………………………………... 20
Material Selection Guide………………………………………………………. 21
Velocity and Pressure- Temperature Ratings of Thermowells…………………. 22
Recommended Thermowell Insertion Lengths………………………………… 23
HOW TO ORDER:……………………………………………………………... 24
3
Type 111 and 113 Standard Screw-in Thermowells
FOR USE WITH THERMOCOUPLES, RTDS AND BI-METAL DIAL THERMOMETERS
ƒ STANDARD LENGTHS accept industry standard BiMetal Dial Thermometers as well as Daily Thermetrics
standard length Thermocouples and RTDs.
ƒ .260 Bore and standard length permit COMPLETE
INTERCHANGEABILITY of Thermocouples RTDs and
Bi-Metal Dial Thermometers.
ƒ IN STOCK for immediate delivery in 304SS and 316SS.
ƒ REDUCED TIP provides fast response and accurate
measurement while retaining pressure and velocity limits
high enough for most general applications.
ƒ .260 BORE accepts standard ¼” O.D. metal sheathed
Thermocouples, RTDs and Bi-Metal Dial Thermometers.
The .260 Bore can also be used with Daily Thermetrics
standard 14 gauge wire with ceramic insulator type single
and duplex Thermocouple elements.
STANDARD SCREW -IN THERMOWELL TYPES
“P”
“Q”
Hex
Type No.
Process
Max. Insertion
Size¹
Connection
Diameter
111
¾” NPT
¾”
1 1/8”
113
1” NPT
7/8”
1 3/8”
¹For special materials when hex is not available, round bar with
wrench flats will be supplied.
STANDARD LENGTHS
Length Code
1
Insertion “U”
2 ½”
Drill Depth “A”
4”
2
4 ½”
6”
3
7 ½”
9”
4
10 ½”
12”
5
13 ½”
15”
4
6
16 ½”
18”
7
22 ½”
24”
Type 115 and 117 Tapered Screw-in Thermowells
FOR USE WITH THERMOCOUPLES, RTDS AND BI-METAL DIAL THERMOMETERS
ƒ STANDARD LENGTHS accept industry standard BiMetal Dial Thermometers as well as Daily Thermetrics
standard length Thermocouples and RTDs.
ƒ .260 Bore and standard length permit COMPLETE
INTERCHANGEABILITY of Thermocouples, RTDs,
and Bi-Metal Dial Thermo meters.
ƒ IN STOCK for immediate delivery in 304SS and 316SS.
ƒ HEAVY DUTY design for reliable performance at fluid
velocities.
ƒ SUPERIOR RESISTANCE to high frequency vibrations.
ƒ GREATER STRENGTH with minimum sacrifice of
sensitivity.
ƒ .260 Bore accepts standard ¼” O.D. metal sheathed
Thermocouples, RTDs, and Bi-Metal Dial Thermometers.
The .260 Bore can also be used with Daily Thermetrics
standard 14 gauge wire with ceramic insulator type single
and duplex Thermocouple elements.
STANDARD SCREW -IN THERMOWELL TYPES
“Q”
“V”
“P”
Max. Insertion
Minimum
Hex
Process
Type No.
Size¹
Diameter
Diameter
Connection
(Root)
(Tip)
115
¾” NPT
7/8”
5/8”
1 1/8”
117
1” NPT
1 1/16”
5/8”
1 3/8”
¹For special materials when hex is not available, round bar with wrench flats
will be supplied.
STANDARD LENGTHS
Length Code
1
Insertion “U”
2 ½”
Drill Depth “A”
4”
2
4 ½”
6”
3
7 ½”
9”
4
10 ½”
12”
5
13 ½”
15”
5
6
16 ½”
18”
7
22 ½”
24”
Type 121 through 128 Screw-in Thermowells with Lagging
Extensions
ƒ Type 111 through 118 Thermowells (pages 3, 4 & 8) are
available with Lagging Extensions.
ƒ Lagging Extensions are used to extend the instrument
connection of the Thermowell through piping insulations.
ƒ The lagging portion of the Thermowell is round, for EASE
of INSTALLATION and less interference with the
insulation.
ƒ Lagging extension lengths are 2” or 3”, depending on the
overall length of the well. These sizes are used to
accommodate up to 2” of insulating material while
utilizing standard insertion lengths and drill depths (except
24” drill depth – see chart)
STANDARD LENGTHS
Length Code
Insertion “U”
Drill Depth “A”
Lagging Extension “T”
2
2 ½”
6”
2”
3
4 ½”
9”
3”
TO SPECIFY TYPE NUMBER:
Change the first two digits of the type number of the
desired Thermowell design from 11 to 12 to add a
lagging extension (eg. Type 111 becomes Type 121
when a lagging extension is required).
4
7 ½”
12”
3”
5
10 ½”
15”
3”
6
13 ½”
18”
3”
7
19 ½”
24”
3”
Test Thermowells
ƒ Plugs are used to keep the inside clean when well is not
in service.
ƒ Brass plugs are recommended to prevent galling with
stainless steel Thermowells.
ƒ 304SS is recommended when corrosive conditions or
high temperatures do not permit the use of brass.
ƒ Supplied with 5” chain.
TO ORDER:
Add plug Number to Part Number of desired Thermowell
Part No.
9100-03
9100-01
6
Material
Brass
304SS
Type 131 and 133 Flanged Thermowells
FOR USE WITH THERMOCOUPLES, RTDS AND BI-METAL THERMOMETERS
ƒ COMPLETE INTERCHANGEABILITY of
Thermocouples, RTDs, and Bi-Metal Dial Thermometers.
ƒ STRAIGHT or TAPERED designs.
ƒ Flanges and Thermowells are STOCKED for FAST
DELIVERY.
ƒ STANDARD LENGTHS accept industry standard BiMetal Dial Thermometers as well as Daily Thermetrics
standard length Thermocouples and RTDs.
ƒ Nominal Flange sizes 1”, 1 ½”, 2”, 3”
ƒ Pressure rating: 150 PSI, 300 PSI, 600 PSI, 1500 PSI,
2500 PSI
ƒ Facing – Raced face (RF)
Ring-Type Joint (RTJ)
ƒ .260 Bore accepts standard ¼” O.D. metal sheathed
Thermocouples, RTDs, and Bi-Metal Dial Thermometers.
The .260 Bore can be used with Daily Thermetrics
standard 14 gauge wire with ceramic insulator type single
and duplex Themocouple elements.
STANDARD LENGTHS
Length Code
1
Insertion “U”
2”
Drill Depth “A”
4”
2
4”
6”
3
7”
9”
FLANGED THERMOWELL TYPES
Type No.
“Q” Maximum
Insertion
Diameter (Root)
“V” Minimum
Insertion
Diameter (Tip)
131
¾”
¾”
133*
1 1/16”
?”
(Tapered)
* Do not use type 133 Thermowells with 1”
flange size, as “Q” DIM is larger than nozzle I.D.
4
10”
12”
5
13”
15”
6
16”
18”
7
22”
24”
OPTIONS FOR FLANGED THERMOWELLS
Part No.
Description
9161
Hydrogen Vent. A 1/8” gap is left in the
backweld to permit venting of trapped
hydrogen.
9162
Flat Face (FF) Flange Surface
9163
125-250 AARH (RMS) Flange Face
Surface Finish
9164-_ _
Welded Raise Face on a Flat Face Flange.
Used to make all wetted surfaces the higher
grade alloy when flange is made of lesser
material than the Thermowell. The last two
digits of the part number is the material
code (from page 19) of the welded raised
face portion.
9165
Stress relieve weld per ASME specification
9166
Heat treat per N.A.C.E. specification
9167
Full penetration weld. Dye penetrant test of
root passes is provided.
TO ORDER OPTIONS:
Add option part no. as suffix to part no. of desired
Thermowell.
7
Thermowells for use with 3/8” Diameter Elements
SCREW-IN, TAPERED SCREW-IN, AND FLANGED
ƒ For 3/8” O.D. Capillary -type sensors, and other 3/8” O.D.
elements
ƒ For most Thermocouples, RTDs, and Bi-Metal
Thermometer applications, .260 bore Thermowells,
shown on pages 4 through 7, are recommended.
3/8” DIAMETER ELEMENT THERMOWELL TYPES
“Q” Maximum
“V” Minimum
Insertion Diameter Insertion Diameter
(Root)
(Tip)
112
Straight
¾” NPT
¾”
¾”
114
Straight
1” NPT
¾”
¾”
116
Tapered
¾” NPT
7/8”
¾”
118
Tapered
1” NPT
1 1/16”
¾”
132
Straight
Flanged
7/8”
7/8”
134*
Tapered
Flanged
1 1/16”
¾”
*Do not use type 134 Thermowells with 1” flange size, as “Q” DIM is larger than nozzle I.D.
Type No.
Straight or Tapered
STANDARD LENGTHS
Length Code
Insertion “U” (112-118)
Insertion “U” (132-134)
Drill Depth “A”
1
2 1/2”
2”
4”
“P” Process
Connection
2
4 1/2”
4”
6”
3
7 1/2”
7”
9”
8
4
10 1/2”
10”
12”
5
13 1/2”
13”
15”
6
16 1/2”
16”
18”
7
22 1/2”
22”
24”
Limited Space Thermowells
LIMITED SPACE THERMOWELL TYPES
ƒ For use in applications requiring short insertion lengths
ƒ Fit 2 ½” Stem Length Thermometers
Part No.
(304SS)
101901
111901
113901
“P”
Process
Connection
½”
¾”
1”
ƒ For other materials, change
the last two digits of the part
no. to the material code of the
desired material shown on
page 19.
Type 101 Thermowells
WITH ½” NPT PROCESS CONNECTION
STANDARD LENGTHS – TYPE 101 THERMOWELLS
ƒ Often used in transfer lines
ƒ Not recommended for lengths exceeding 12”. For longer
lengths, use ¾” or 1” NPT process connections
ƒ If .385 bore is required, specify Type 102 Thermowells.
O.D. is .625 for the entire insertion length
Length Code
Insertion “U”
Drill Depth “A”
9
1
2 ½”
4”
2
4 ½”
6”
3
7 ½”
9”
4
10 ½”
12”
Thermowells With Special Connections
VAN STONE THERMOWELLS – TYPE 141-144
ƒ For 1” and 1 ½” pipe sizes
ƒ If two piece welded construction is acceptable, follow
Thermowell part no. with 9180
ƒ Carbon steel backing flanges are available. Specify pressure
rating
STANDARD LENGTHS FOR VAN STONE
THERMOWELLS
Length Code
1
2
3
4
5
2”
4”
7”
10”
13”
Insertion “U”
4”
6”
9”
12”
15”
Drill Depth “A”
Type
No.
“B”
Bore
Size
“Q”
Outside
Diameter
“P”
Offset
Diameter
141
142
143
144
.260”
.385”
.260”
.385”
¾”
7/8”
¾”
7/8”
1.315”
1.315”
1.900”
1.900”
6
7
16”
18”
22”
24”
“R”
Raised
Face
Diameter
2”
2”
2 7/8”
2 7/8”
OPTIONAL CARBON STEEL BACKING
FLANGES
Flange
Pressure Rating - PSI
Size
150
300
600
1”
97105
97205
97305
1 ½”
98105
98205
98305
Pipe
Size
1”
1”
1 ½”
1 ½”
1500
97405
98405
GROUND JOINT THERMOWELLS – TYPE 145-148
ƒ Can be replaced with Standard Flanged Thermowells
shown on pages 7 and 8
Type
No.
145
146
147
148
“B”
Bore
Size
.260”
.385”
.260”
.385”
STANDARD LENGTHS FOR GROUND JOINT THERMOWELLS
Length Code
1
2
3
4
5
Insertion “U”
3 1/4”
6 1/4”
9 1/4”
12 1/4”
Drill Depth “A”
6”
9”
12”
15”
10
1 3/8”
1 3/8”
1 ¾”
1 ¾”
“Q”
Diameter
at Radius
¾”
¾”
1 ¼”
1 ¼”
6
15 1/4”
18”
7
21 1/2”
24”
“O”
Diameter
“P”
Process
Connection
1”
1”
1 ¼”
1 ¼”
SOCKET WELD THERMOWELLS – TYPE 151-154
ƒ Must be field welded, and cannot be replaced once installed
ƒ Available in tapered design. Check interference of well O.D.
with weldolet I.D.
Type
No.
151
152
153
154
“B”
Bore
Size
.260”
.385”
.260”
.385”
STANDARD LENGTHS FOR SOCKET WELD THERMOWELLS
Length Code
1
2
3
4
Insertion “U” (Socket Weld)
2 ½”
4 1/2”
7 1/2”
10 1/2”
Drill Depth “A” (Socket Weld)
4”
6”
9”
12”
“Q” Outside
Diameter
“P” Weld
Area Diameter
Pipe
Size
¾”
7/8”
¾”
7/8”
1.050”
1.050”
1.315”
1.315”
¾”
¾”
1”
1”
5
13 1/2”
15”
6
16 ½”
18”
7
22 1/2”
24”
WELD-IN THERMOWELLS – TYPE 155 AND 156
ƒ For high pressure and high velocity service, as found in
steam lines
ƒ Use when either ASME Boiler and Pressure Vessel Codes or
Piping Class Sheets require welded connections
ƒ Standard materials are 304SS, 316SS, ASTM A182-F11 and
ASTM A182-F22
STANDARD LENGTHS FOR WELD-IN THERMOWELLS
Length Code
3
4
Insertion “U”
2 ½”
4 ½”
Drill Depth “A”
9”
12”
Head Dimension “H”
6 ¾”
7 ¾”
Type No.
155
156
11
“B”
Bore Size
.260”
.385”
Options for Thermowells
TANTALUM SHEATH FOR FLANGED
THERMOWELLS – PART NO. 9130
ƒ Sheath covers all wetted surfaces of thermowell
ƒ Provides corrosion protection in highly corrosive
environments such as chlorine, bromine, hydrochloric,
nitric, sulfuric and mixed acids without product
contamination
ƒ Low fouling factor
ƒ Tube wall is .013” thick for rapid heat transfer, flange is
.015” thick
ƒ Use with type 131 and 132 type flanged thermowells
ƒ O.D. of thermowell is ground to provide perfect match
with I.D. of sheath
SPECIAL COATINGS – PART NO’S 9131-9138
The properties of the base metal of Daily Thermetrics
thermowells can be improved with the addition of
fluoroplastic or metal-based coating. Metal coating improves
the erosion and corrosion resistance of thermowells, and
fluoroplastics are generally more resistant to chemical
corrodents than are metals or metal-based coatings. Our
engineering staff can assist in selecting the proper coating for
your application.
ƒ Coatings are 1/32” thick (F Dimension). Specify if other
thicknesses are required
ƒ Coatings are applied to finished dimensions of
thermowells so that final O.D. will be 1/16” (nom) larger
than original size shown in this catalogue.
Part No.
Type
Of
Coating
Hardness
Remarks
9131-K__
Teflon²
-
9132-K__
Kynar³
-
9133-K__
Stellite #64
41 Rc
9138-K__
Stellite #64
41 Rc
9134-K__
Stellite #14
53 Rc
9135-K__
Wallex 505
56 Rc
9136-K__
CFS-5
59 Rc
9137-K__
CFS-131-5
67 Rc
A fluoroplastic which is excellent for processes in which fouling is a problem. Very resistant to
chemical corrodents. Not recommended for use in abrasive situations. Best for use in temperature
below 500°F. Thermowells are also available in solid Teflon.
A fluoroplastic which is very good against chemical corrodents. Typically less expensive than Teflon
and more resistant to abrasives, but temperature should not exceed 200°F. Thermowells are also
available in solid Kynar.
A cobalt -based fused coating which provides very good abrasion resistance and good chemical
corrosion resistance. Coating is 1/32” thick, unless specified otherwise.
Same as above except coating is welded to base metal rather than sprayed on and fused. Provides
excellent bonding to base metal.
A cobalt -nickel based fused coating which provides excellent abrasion resistance and good resistance
to corrosion. Coating is 1/32” thick unless specified otherwise.
A cobalt -nickel based fused coating which provides excellent abrasion resistance and good chemical
corrosion resistance. Coating is 1/32” thick unless specified otherwise.
A cobalt -nickel based coating which provides excellent abrasion resistance and excellent resistance to
chemical corrosion. Excellent high temperature hardness, and superior resistance to thermal shock.
Coating is 1/32” thick unless specified otherwise.
Our hardest material for high temperatures with extreme abrasion. Consists of a very hard chromium
carbide material applied by the Jet Coat II Detonation Process on to a special cobalt -nickel base
coating. Highly recommended for cat crackers (FCCU), cokers, and ethylene units.
ROUNDED TIP-Thermowells can be supplied with a rounded tip. Note that the “U” dimension and
tip thickness will be 1/8” (nom) longer to allow for rounding.
Thermowells may be undercut the desired coating thickness, and the coating surface ground and
polished to the original thermowell O.D. leaving a smooth 20 RMS finish. For this option, specify
part no. 9149. (Metal coatings only)
9148
OPTION
9149
OPTION
¹Please specify length to be coated.
(K Dimension) in place of line ( _ )
shown.
-
4
²Trademark E.I. du pont de Nemours & Co.
³Trademark Pennwalt Corp.
5
12
Trademark Stoody Corp.
Trademark Wall-Colmonoy Corp.
THERMOWELLS WITH SOLID STELLITE NO. 6
TIP PART NO. 9140-K__
Any thermowell design in this catalog can be furnished
with a solid satellite tip.
ƒ Provides thicker wall of Stellite for greater erosion
resistance
ƒ Can be supplied with a rounded tip. TO ORDER THIS
FEATURE, specify part no. 9148.
TO ORDER: Add part no. as a suffix to the part no. of the
desired thermowell design. Replace line following “K” with
desired Stellite tip length.
SPECIAL TESTING
The following tests may be performed on any thermowell
shown in this catalogue.
ƒ Other tests are available. Please consult out engineering
department for special assistance.
SPECIAL TESTING – PART NO’S 9150-9153
Part No.
Item
Remarks
9150
Internal Hydrostatic Test Thermowells are tested at 3000 PSI for five minutes. Only distilled water is used
in order to prevent chlorine pervasion. Please specify if other pressure or time is
required.
9151
Dye Penetrant Test
Ensures that the surface area of weld is free of pinholes or cracks. Use for flanged
thermowells.
9152
Radiograph (X-Ray)
Indicates weld integrity. Also examines concentricity of bore to O.D. of weld and
tip thickness.
9153
External Hydrostatic Test Generally recommended for metal protection tubes used with reactor-type
multipoint thermocouple assemblies and other critical applications. Test is at 3000
PSI for five minutes for threaded wells. Flanged connections are tested in
accordance with ANSI B16.5. Please specify if other pressure or test time is
required.
13
Metal Protection Tubes – Type 800 Series
ƒ ½” Schedule 40 is standard for most Thermocouple and
RTD applications. Our engineering staff can assist in
sizing pipe for multipoint assemblies or if additional
strength is required
ƒ Standard materials are 304SS, 316SS, Carbon Steel,
446SS, and Inconel 600
ƒ Other pipe sizes and materials are available
ƒ Note that length codes for metal protection tubes are not
the same as codes for standard Thermowells
ƒ Recommended when wells of lengths 30” or longer are
required
ƒ Can be used with Multipoint Thermocouple and RTD
assemblies
ƒ Large variety of applications including furnace stack and
reactor vessel temperature measurement
STANDARD LENGTHS
Length Code
01
Length
12”
02
18”
03
24”
04
30”
05
36”
06
48”
07
60”
*Note that length codes for metal protection tubes are not the same as codes for standard Thermowells.
14
08
72”
00
Other Specify
METAL PROTECTION TUBE TYPE NUMBERS
Type No.
“Q”
“B”
Pipe
Wall
Pipe
Nom.
Nom.
“S” Inst.
“P” Process
W/Carbon
Size
Thickness
Schedule
O.D.
I.D.
Conn. NPT Connection NPT
Plain
Steel
W/Flange
(IN)
(IN)
Bushing*
(IN)
(IN)
821
825
821
¼”
40
.540”
.364”
.088”
¼”
¾”
822
826
822
¼”
80
.540”
.302”
.199”
¼”
¾”
841
845
841
½”
40
.840”
.622”
.109”
½”
1”
842
846
842
½”
80
.840”
.546”
.147”
½”
1”
851
855
851
¾”
40
1.050”
.824”
.113”
¾”
1 ¼”
852
856
852
¾”
80
1.050”
.742”
.154”
¾”
1 ¼”
861
865
861
1”
40
1.315”
1.049”
.133”
1”
1 ½”
862
866
862
1”
80
1.315”
.957”
.179”
1”
1 ½”
*For other bushing materials, add suffix 9195-__ __ to part no. The last two digits reflect the material code from page 19
OPTIONAL SENSITIVE TIP FOR METAL
PROTECTION TUBES PART NO’S 9190 AND 9191
ƒ Metal-to-metal contact with sensor provides fast
temperature response
ƒ Tip and protection tube material shall be the same,
unless specified otherwise
ƒ Other tip materials include copper, silver, aluminum or
platinum for super fast temperature response. Consult
factory for design assistance and limitations
Use With
Sensitive
Tip
Part No.
Bore
Size
9190
9191
.260”
.385”
RTDs and
Sheathed
Thermocouples
¼” O.D.
3/8” O.D.
Bare Wire and
Insulator
Thermocouples
14 AWG
8 AWG (Single Only)
TO ORDER METAL PROTECTION TUBES:
1. Select type no. of Protection Tube
e.g. 8 3 1 __ __ __ __
2. Add length code from chart as 4th
e.g. 8 3 1 0 4 __ __
and 5th digit of part no.
3. Add material code from page 15 as
6th and 7th digit of part no.
e.g. 8 3 1 0 4 0 1
4. Flanged designs: add Flange part no.
fro m page 24
e.g. 8 3 1 0 4 0 1 – 2 1 0 1
15
Ceramic Protection Tubes – Type 191 through 196
ƒ Higher temperature limits than metal
ceramic protection tubes
ƒ Chemically inert
TO ORDER METAL-CERAMIC AND CERAMIC PROTECTION
TUB ES:
1. Select Type No. of Protection Tube
ALUMINA
ƒ Recommended for Platinum Rhodium
Thermocouples (Types R, S, and B)
Re-crystallized aluminum oxide (over 99.5% pure)
tubes have a maximum working temperature of
3452°F. Above 2192°F they have the highest
strength of any of our ceramic tubes. Good
thermal conductivity. Highly resistant to reducing,
oxidizing and high vacuum atmospheres, corrosive
alkaline vapors and aluminum chloride vapors.
Stable to acids, alkalis, metal melts, most glass
fluxes, salt melts and slags.
Alumina tubes are impermeable to most gasses.
Highly recommended for use with thermocouples
containing platinum, iridium and rhodium because
of their relative freedom from SiO2 and Fe2O3
contaminants.
*Note that Type 194 is the most commonly used ceramic tube.
Type No.
Available
Tube
w/Stainless
w/Instrument
Materials
O.D.
Plain
Steel
Connection
Fitting
Alumina
191
192
3/8”
Mullite or
193
194
11/16”
Hexoloy
195
196
1”
Metal
197
198
199
7/8”
Ceramic
Tube
I.D.
“P” Process
Connection
¼”
7/16”
¾”
¾”
1”
1 ½”
5/8”
1”
2. Add length code from chart as 4th and 5th digit of part no.
*Metal Ceramic Tubes have 48” maximum length.
Length Code
01
02
03
04
05
Length
12” 18” 24”
30”
36”
06
48”
07
60”
08
72”
00
Other
3. Add material code as 6th and 7th digits of part no.
MULLITE
Mullite (silica-alumina) protection tubes can be
used to 3000°F. They are impervious to air to
3000°F, to dry hydrogen and carbon monoxide to
2550°F, and will maintain 105 mm. Hg. to 2642°F.
Good thermal shock resistance. Acid slag
resistance is good, basic slag resistance is fair.
Low sag. Use with J, K and T thermocouples.
HEXOLOY* (Sintered alpha-silicon carbide)
Hexoloy can be used to above 3000°F. Impervious
to gasses at pressures above 31MPa. Superior
chemical resistance in oxidizing and reducing
environments. Excellent in strong acids, such as
conc. HNO3, H2SO4, and HCI/HF, and strong
bases such as NaOH. Thermal shock better than
alumina, and thermal conductivity is better than
stainless steel. Superior abrasion and erosion
characteristics.
Ordering Code
Standard Materials
Max. Operating Temp.
31
32
33
34
Mullite
99.5% pure Alumina
Metal-Ceramic
Hexoloy
3000°F
3450°F
2200°F to 3000°F
3000°F
TO ORDER FLANGED MOUNTING:
For flanged mounting, use separate threaded flange with type 192, 194, 196, or 198
protection tube (with threaded fitting). Flange is supplied separately from the protection
tube to avoid breakage during shipment.
TO ORDER, specify part number 9170, succeeded with flange part number from page
24.
16
Metal Ceramic Protection Tubes – Type 197 through 199
ƒ Higher temperature limits than metal protection tubes
ƒ More corrosion resistant than metal in most applications
ƒ Less brittle than ceramic
ƒ More resistant to thermal shock and abrasion than ceramic
Metal-Ceramic is a composite of two high temperature
materials, chromium and aluminum oxide. Metal-Ceramic tubes
are stronger and more resistant to thermal shock than ceramic
materials, but are relatively brittle as compared to metals.
Abrasive conditions at temperatures to 2300°F have little effect
on Metal-Ceramic tubes, and chemicals such as sulfur dioxide,
sulfur trioxide and concentrated sulfuric acid have a low rate of
attack on the material. Ferrous alloys, copper, brass, zinc, lead
and many other metals do not wet on metal ceramic.
Metal-Ceramic has good strength at temperatures where many
high-temperature metals melt. Above about 2800°F, it begins to
soften, however, they have been used successfully for dip
immersion at a temperature of 3000°F. Care must be taken to
avoid conditions of extreme thermal shock, extreme thermal
gradients, mechanical shock, and impact.
Because Metal-Ceramic tubes are less resistant to shock and
impact than the metallic alloys, they should be preheated to
about 900°F before immersion in molten metal at 2000°F or
higher. A commonly used preheat procedure is to hold the tube
immediately above the molten metal for approximately one
minute before immersing.
When used with platinum rhodium thermocouples, an alumina
primary tube should be used. This is to prevent contamination of
the thermocouple by the metal-ceramic material. TO ORDER
THIS OPTION, specify Type 191-_ _ _. The last 3 digits is the
type number of the desired Metal-Ceramic Tube as shown on
page 16.
RECOMMENDED APPLICATIONS:
ƒ Molten copper and brass to 2100°F intermittent and
continuous immersions
ƒ Corrosive SO2 and SO3 gas (to 2500°F) and SO3 and HF gas
(to 2000°F)
ƒ Open hearth furnace checker chambers to 2450°F
ƒ Steel mill soaking pits to 2500°F
ƒ Pelletizing chamber of Taconite refining operation to 2100°F
ƒ Molten zinc to 1600°F
ƒ Molten lead to 650°F
ƒ Basic steels and slags to 3150°F (intermittent) and 2500°F
(continuous) in open hearth and general foundry practices
ƒ Calcining kilns to 2200°F
ƒ Barium titanate (barium oxide service) to 2200°F
ƒ Magnesium oxide calcining kilns
ƒ Fluid bed cement process with severe corrosion and
temperature to 2400°F (fluid method of producing builders
cement)
ƒ Gas and ethylene cracking atmosphere
ƒ Atmosphere directly upon burring sodium (1800°F-2500°F)
ƒ Oil fired furnace chambers
ƒ Atmosphere directly above molten glass in an open hearth
glass furnace
ƒ Molten silver solder
ƒ Molten tin
ƒ Borax flux
ƒ Copper matte
ƒ Boiling sulphuric acid -97°F
ƒ Blast furnace stove dome and bustle pipes
NON-RECOMMENDED APPLICATIONS
ƒ Molten aluminum
ƒ Cryolite
ƒ Tin (stannous) chloride (750°F)
ƒ Acid slag
ƒ Carbide slag
ƒ Molten glass
ƒ Boiling sulfuric acid -10%
ƒ Carburizing atmospheres
ƒ Nitriding atmospheres
ƒ Barium chloride salt bath
ƒ Sodium Nitrate-nitrate salt bath
17
Technical Information and Design Considerations
In selecting the proper thermowell, velocity and vibrations
generated by the flowing media, temperature, pressure, and
corrosion should be considered. The following pages can
assist in the selection. Please consult factory if additional
information or recommendations for specific applications
are required.
A.
B.
PRESSURE
The following formula may be applied in calculating
the maximum operating pressure of a thermowell.
This formula does not apply for type 101, 111, 113,
121, and 123 thermowells.
VIBRATION*
Flowing liquids generate a vibration at the thermowell
with a “wake frequency”. Thermowells have a “natural
frequency”. A thermowell should not work in resonance.
To verify that for tapered thermowells the following
calculations should be made.*
A-1 NATURAL FREQUENCY
C.
MAXIMUM LENGTH OF THERMOWELL*
In addition to vibratory considerations, s teady state
stress also limits maximum length. The following
formula applies:
C-1 MAXIMUM LENGTH
VALUES OF K
Insertion Length
“U”
2 ½”
4 ½”
7 ½”
10 ½”
13 ½”
22 ½”
f
TABLE 1
Bore Size of Thermowell
.260”
.385”
2.06
2.42
2.07
2.45
2.08
2.46
2.09
2.47
2.09
2.47
2.09
2.47
A-2 WAKE FREQUENCY
Constant
TABLE 2*
Bore Size of Thermowell
.260”
.385”
0.412”
0.334”
37.5”
42.3”
0.116”
0.205”
*For limitations of this method see Powertest
Code Supplement, Part 3
A-3 RELATIONSHIP WAKE/NATURAL FREQUENCY
(r) shall not exceed the value of .8, in formula
PLEASE CONSULT FACTORY FOR ENGINEERING
ASSISTANCE.
18
How to Order Thermowells
THERMOWELL TYPE NUMBER
Select Thermowell Type Number from Pages 4 to 11
THERMOWELL LENGTH CODE (Does not apply to Protection Tubes-See pages 14 through 17)
Code
Insertion Length “U”
Drill
Types
Types
Types
Types
Depth
101 thru 118
145 thru 148
“A”
121 thru 128 131 thru 144
151 thru 154
155 & 156
4
2½
2
1
6
4½
2½
4
3¼
2
9
7½
4½
7
6¼
3
12
10 ½
7½
10
9¼
4
15
13 ½
10 ½
13
12 ¼
5
18
16 ½
13 ½
16
15 ¼
6
24
22 ½
19 ½
22
21 ¼
7
Other-Specify
0
THERMOWELL MATERIAL CODE
Code
Material
0
0
1
2
304 Stainless Steel – Standard
316 Stainless Steel – Standard
See page 19 for ordering code numbers for other materials
FLANGE PART NUMBERS (For types 1310-134 and 180-188)
Flange Pipe Size Facing
Pipe Size
1”
1 ½”
2”
1”
1 ½”
2”
3”
1
2
3
4
5
6
7
Facing
RF
RF
RF
RTJ
RTJ
RTJ
RF
Flange Pressure Rating
150#
300#
400-600#
900-1500#
2500#
Other-Specify
1
2
3
4
5
0
Flange Material
0
0
0
---------
1
2
5
304 Stainless Steel
316 Stainless Steel
Carbon Steel
Other-See page 19 for code number
------Option Part No.
(if required)
24